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The CoralVue Hydros Auto Top-Off (ATO) Kit (HDRS-ATO-200) comes with everything you need to use your Hydros device (Control 2 or Control 4) as an ATO system. NOTE: You must have a Hydros Controller (Control 2 or Control 4) for this product.

The Hydros Water Level Sensor contains no moving parts that can fail. It’s extremely tiny: it’s a little over a half-inch thick with a circumference the size of a US penny. The optical eye is magnetically coupled with the magnet side measuring only 1/4" thick. It can be mounted to most clear, tinted, or painted surfaces up to ½” thick. The sensor connects with any Hydros Sense Port using an aviation-style plug for safe operation. No additional power source is needed to run the sensor.

The Hydros DC Micro Pump is powerful despite its small size. The pump measures 1.6” L x 1.062” W x 1.45” H. The pump has a maximum head pressure of 8’. The flow rate of the pump is 74 gallons per hour. This 12V brushless pump draws a maximum of 4.5W and has an average life expectancy of 30,000 hours (over 3 years). When connected to a Drive Port on the Hydros Control 2 or Control 4, the controller will supply power to the pump so no additional cords or power bricks are required for operation. Using a Hydros aquarium controller for your auto top-off system is not only a reliable solution, but it also helps clear wire clutter in and around your aquarium.

Hydros Water Level Sensor (plugs into Hydros Sense Port)
Hydros DC Micro Pump (plugs into Hydros Drive Port)
Hang-On Tubing Mount
Tubing (8.5mm OD - 6.5mm ID)
Siphon Break